This is the black drainage tubing you see at hardware stores.  It's heavy
duty corrugated plastic with air slits, and easily cut.  I have used what
I can (and may I say how much more attractive my house is with this
tubing running everywhere-not).
 
I'm near Schaumburg.  -e-mail me privately if you would like it.
 
anne in chicago
[Posted in FML issue 4919]